Device and method for detecting conductivity of tungsten filament in laminated glass of front windshield of automobile

Abstract

The invention relates to the technical field of automobile glass production and processing, and discloses a device and a method for detecting conductivity of tungsten filaments in automobile front windshield laminated glass. The device comprises a portal frame (1) erected above a glass transmission line, a thermal infrared imager (2) and a display (3) are arranged on the portal frame (1), and the thermal infrared imager (2) is connected with an on-line real-time detection system. The on-line real-time detection system is arranged to irradiate the to-be-detected automobile front windshield laminated glass on the glass transmission line and feed back a result to the on-line real-time detection system, and the result is displayed on the display (3) and an alarm is given after the result is recognized by the on-line real-time detection system. The device for detecting the conductivity of the tungsten filament in the automobile front windshield laminated glass can quickly and accurately identify the non-conductive tungsten filament, effectively prevents unqualified products from flowing out, is high in detection efficiency, ensures good demisting and deicing effects of automobile glass, and improves the driving safety.

Description

Technical Field

[0001] This invention relates to the field of automotive glass manufacturing and processing technology, specifically to a device and method for detecting the conductivity of tungsten wire inside laminated windshield glass. Background Technology

[0002] Tungsten has moderate resistivity and can quickly generate Joule heat when energized. Therefore, embedding tungsten wires into automotive laminated glass aims to achieve rapid defogging and de-icing. Compared with traditional air conditioning that relies on airflow circulation for defogging, directly heating the glass is more efficient.

[0003] The heating wires inside a car's windshield are approximately 0.027mm in diameter, with a spacing of about 2mm between two wires. Except for a 6mm wide section in the center, the entire windshield is covered with heating wires. The working state of these wires affects the windshield's de-icing and defogging effects. Therefore, during production, it's necessary to screen the windshield heating wires for defects to ensure the windshield's quality. A typical laminated car windshield contains approximately 400-500 tungsten heating wires. Traditional manufacturing processes check the conductivity of each wire before laminating the two pieces of glass; after lamination, the status of each wire cannot be identified. However, subsequent production processes can cause wires to break or detach from the busbars. Since the wires are connected in parallel, subsequent inspections can only check conductivity, not individual wire heating, leading to defective products. In cold weather, non-conductive tungsten wires heating up can impair visibility while driving, creating a safety hazard. Summary of the Invention

[0004] The purpose of this invention is to overcome the problem in the prior art that it is difficult to identify whether each tungsten wire can conduct electricity and generate heat normally when testing the conductivity of tungsten wires inside laminated windshields of automobiles. This invention provides a device for detecting the conductivity of tungsten wires inside laminated windshields of automobiles. This device can quickly and accurately identify non-conductive tungsten wires, effectively prevent unqualified products from being released, has high detection efficiency, ensures good defogging and de-icing effects of automobile glass, and improves driving safety.

[0005] To achieve the above objectives, the present invention provides a tungsten wire conductivity detection device for laminated windshield glass in automobiles. The device includes a gantry frame mounted above a glass transport line. An infrared thermal imager and a display are mounted on the gantry frame. The infrared thermal imager is connected to an online real-time detection system and is configured to illuminate the laminated windshield glass to be inspected on the glass transport line and feed the result back to the online real-time detection system. After being identified by the online real-time detection system, the result is displayed on the display and an alarm is triggered.

[0006] Preferably, the infrared thermal imager is positioned at the center of the top of the gantry and illuminates the laminated windshield of the vehicle to be inspected on the glass conveyor line.

[0007] Preferably, the display is positioned above the glass transmission line and connected to the gantry via a cantilever.

[0008] Preferably, the cantilever is configured to drive the display to turn, flip, and fold for storage.

[0009] Preferably, one side of the gantry is provided with an operating table at the same level as the glass conveying line. The operating table is used to temporarily store the laminated windshield glass of automobiles that fails the inspection.

[0010] Preferably, the tungsten filament conductivity detection device inside the laminated windshield of an automobile also includes a barcode scanner, which is configured to scan the QR code on each piece of laminated windshield glass and transmit the acquired information to the online real-time detection system, while simultaneously triggering a detection signal.

[0011] Preferably, the online real-time detection system is configured to identify and alarm on the broken lines on both sides and the edge of the central divider of the car's windshield laminated glass.

[0012] Preferably, the online real-time detection system is configured to identify, alarm, and record situations where the entire or half of the laminated windshield of a car is not heated.

[0013] Preferably, the alarm of the online real-time detection system is an audible and visual alarm.

[0014] The second aspect of the present invention provides a method for detecting the conductivity of tungsten wires inside laminated windshields of automobiles. This method uses the aforementioned device for detecting the conductivity of tungsten wires inside laminated windshields of automobiles to perform the detection of the conductivity of tungsten wires inside laminated windshields of automobiles.

[0015] According to the above technical solution, this invention adds a gantry crane to the glass production line, uses an infrared thermal imager to screen out faulty heating wires, and an online real-time detection system can automatically determine NG (non-conforming) or OK (conforming) products through dedicated image analysis software. See details. Figure 1 and Figure 2 .in, Figure 1 This displays the effect under normal working conditions. Figure 2 The area circled in red indicates an abnormal state of the heating wire, which is not generating heat properly, resulting in a low temperature and forming a dark stripe. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the results of the online real-time detection system for detecting qualified products in an automotive windshield laminated glass tungsten wire conductivity detection device according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the results of detecting defective products in the online real-time detection system of the tungsten wire conductivity detection device inside the laminated glass of an automobile windshield according to an embodiment of the present invention. Figure 3 This is a logic diagram of a tungsten wire conductivity detection device inside a laminated windshield glass of an automobile according to an embodiment of the present invention. Figure 4 This is a schematic diagram of the tungsten wire conductivity detection device inside the laminated glass of an automobile windshield according to one embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures 1-Gantry frame 2-Infrared thermal imager 3-Monitor 4-Control Panel 5-Cantilever Detailed Implementation The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0018] In this invention, unless otherwise stated, directional terms such as "top," "center," and "above" in the terminology represent only the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.

[0019] See Figure 3 and Figure 4 The present invention provides a tungsten wire conductivity detection device for laminated windshield glass of automobiles. The tungsten wire conductivity detection device for laminated windshield glass of automobiles includes a gantry frame 1 erected above the glass transmission line. An infrared thermal imager 2 and a display 3 are installed on the gantry frame 1. The infrared thermal imager 2 is connected to an online real-time detection system and is configured to illuminate the laminated windshield glass of the automobile to be inspected on the glass transmission line and feed the result back to the online real-time detection system. After being identified by the online real-time detection system, the result is displayed on the display 3 and an alarm is triggered.

[0020] Through the above technical solution, a gantry frame 1 is added to the glass production line, and an infrared thermal imager 2 is used to screen out faulty heating wires. The online real-time detection system can automatically determine NG (non-conforming) or OK (conforming) products through dedicated image analysis software. See details. Figure 1 and Figure 2 .in, Figure 1 This displays the effect under normal working conditions. Figure 2 The area circled in red indicates an abnormal state of the heating wire, which is not generating heat properly, resulting in a low temperature and forming a dark stripe.

[0021] In this embodiment, to optimize the installation position of the infrared thermal imager 2, it is preferable to place the infrared thermal imager 2 at the top center of the gantry 1 and direct it towards the laminated windshield glass of the vehicle to be inspected on the glass conveyor line. This way, placing the infrared thermal imager 2 at the top center allows for vertical coverage of the entire windshield on the glass conveyor line, effectively avoiding perspective distortion during side mounting. Simultaneously, placing the infrared thermal imager 2 at the top center keeps it away from vibration sources on the conveyor line, reducing image blurring and mitigating interference from moisture and dust reflections on the production line.

[0022] In this embodiment, to optimize human-machine interaction efficiency, meet real-time monitoring requirements, and optimize production line space, the display 3 is preferably positioned above the glass conveyor line and connected to the gantry 1 via a cantilever 5. This allows the display 3 to work in conjunction with the infrared thermal imager 2, instantly displaying a thermal map of the windshield's heating uniformity, temperature distribution data, and defect alarm information, facilitating quick assessment by operators. Since the infrared thermal imager 2 is already mounted on the gantry 1, extending and fixing the display 3 via the cantilever 5 avoids additional space occupation and adapts to a compact production line layout. Furthermore, the display 3 can be configured to provide touch operation, allowing operators to adjust detection parameters (such as temperature thresholds and alarm ranges), switch view modes, or retrieve historical data.

[0023] Furthermore, to meet multiple requirements such as production line flexibility, ergonomic optimization, and ease of equipment maintenance, the cantilever 5 is preferably configured to drive the display 3 to rotate, flip, and fold for storage. This allows the cantilever 5 to drive the display 3 to rotate left and right, adapting to different operator positions or multi-person collaborative inspection scenarios. Adjusting the tilt angle of the display 3 via the cantilever 5 for flipping avoids glass reflections or accommodates differences in operator height, thereby reducing operator neck fatigue. In addition, during equipment maintenance, cleaning, or non-production periods, folding the display 3 and placing it against the gantry 1 via the cantilever 5 effectively avoids obstructing passageway space or accidental collisions, preventing equipment damage and extending its service life.

[0024] In this embodiment, a workbench 4, preferably located on the same horizontal plane as the glass conveyor line, is preferably provided on one side of the gantry 1. The workbench 4 is used to temporarily store defective laminated windshield glass. Using this workbench 4 ensures that defective products are immediately removed from the main production line, preventing them from being mixed with qualified products. Simultaneously, the workbench 4 is located very close to the gantry 1, facilitating quality inspectors to conduct nearby re-inspections. It allows direct retrieval of the original data (such as temperature distribution maps) from the thermal imager, enabling comparison with the actual product to analyze the cause of defects. Furthermore, if the defect is repairable, it can be quickly repaired directly on the workbench, avoiding the time-consuming process of returning to the starting station.

[0025] Based on the requirements of intelligent traceability, automated testing processes, and refined quality control in the production of laminated automotive windshield glass, the preferred tungsten filament conductivity detection device for this laminated automotive windshield glass also includes a barcode scanner. The scanner is configured to scan the QR code on each piece of laminated automotive windshield glass and transmit the acquired information to the online real-time detection system, simultaneously triggering a detection signal. Since each piece of glass has a unique ID associated with its production batch, process parameters, and supplier information, after scanning, the system automatically retrieves the glass's preset standard parameters and compares them with the measured data from the infrared thermal imager, thus binding the detection results with production data. Furthermore, after recognizing the QR code, the scanner can immediately send a trigger signal to the infrared thermal imager via an I / O port or the Profinet protocol, ensuring strict synchronization between the detection timing and the glass's position. Unscanned glass cannot enter the testing station, forming an efficient mechanism to prevent missed detections.

[0026] In this embodiment, based on a comprehensive consideration of the high-failure characteristics of the tungsten filament heating system, glass safety standards, and thermodynamic behavior, the online real-time detection system is preferably configured to identify and alarm on the broken wires on both sides and the edge of the central dividing area of ​​the automotive windshield laminated glass.

[0027] Furthermore, as a safety-related component, the heating system needs to detect full-function failure (the entire surface is not heated) and partial failure (half of the surface is not heated) to prevent traffic accidents caused by defogger failure. Preferably, the online real-time detection system is set to be able to identify, alarm and record the situation of the entire surface and half of the laminated windshield of the car being not heated.

[0028] Furthermore, to ensure the effectiveness of the multi-sensory coordinated alarm of the tungsten filament conductivity detection device within the laminated windshield of the automobile, it is preferable that the alarm of the online real-time detection system be an audible and visual alarm. This allows for two main benefits: firstly, visual alarms, which are unaffected by ambient noise, can effectively transmit information even in high-decibel workshops and can quickly locate the source of the alarm, even in noisy and obstructed production line environments; secondly, audible alarms, such as siren alarms, trigger directional reflexes in human hearing for immediate wake-up and location. In addition, differentiated tones can further assist operators in quickly determining the alarm level.

[0029] Another aspect of this invention provides a method for detecting the conductivity of tungsten filaments within laminated automotive windshields. This method utilizes the aforementioned tungsten filament conductivity detection device for detecting the conductivity of tungsten filaments within laminated automotive windshields. This method enables the identification and alarm of broken wires in different areas, including the side edges and the edge of the central dividing zone of the glass. It also automatically identifies qualified and unqualified parts, and provides audible and visual alarms. Furthermore, it identifies instances where the entire or half of the glass is not heated after power-on, classifying them as unqualified. Additionally, a printed QR code can be affixed to the glass. After power-on, the QR code is scanned with a barcode scanner (with a delay before detection begins), and the QR code data is recorded in the software. After detection, the QR code data is linked to the test results. On the query page, scanning the QR code with a barcode scanner allows access to the completed infrared records; clicking on a record will display the corresponding infrared image. It is evident that this method for detecting the conductivity of tungsten filaments inside laminated automotive windshields can rapidly identify defective products through infrared thermal imaging, representing a significant improvement over the inefficient and prone-to-missing methods relying on visual inspection. Furthermore, existing detection methods are offline operations, which can easily cause secondary damage to the products, and product accumulation on-site can lead to other complex problems. This method, however, utilizes an online inspection line, ensuring rapid flow and high efficiency. In addition, the results obtained through this method can be recorded, printed, and affixed to the products for easy traceability and subsequent retrieval.

[0030] In summary, the tungsten wire conductivity detection method for laminated windshield glass provided by this invention improves the original inspection process from: pre-laminated glass electrical testing - problem detection and containment - qualified products transferred to packaging production - finished products offline electrical wire testing - defective products discarded - qualified products shipped using unloading equipment. The improved process is: automated packaging production line - online testing - non-conforming alarm isolation and discard - printing test results and affixing them to the glass - defective products discarded - qualified products shipped using unloading equipment. The entire process is accurate, efficient, and reliable.

[0031] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.

Claims

1. A device for detecting the conductivity of tungsten wire inside laminated windshield glass of an automobile, characterized in that, The tungsten wire conductivity detection device for the laminated windshield of an automobile includes a gantry (1) mounted above the glass transmission line. The gantry (1) is equipped with an infrared thermal imager (2) and a display (3). The infrared thermal imager (2) is connected to an online real-time detection system and is configured to illuminate the laminated windshield of the automobile to be inspected on the glass transmission line and feed the result back to the online real-time detection system. After being identified by the online real-time detection system, the result is displayed on the display (3) and an alarm is triggered.

2. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 1, characterized in that, The infrared thermal imager (2) is positioned at the top center of the gantry (1) and illuminates the laminated windshield of the car to be inspected on the glass transmission line.

3. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 1, characterized in that, The display (3) is positioned above the glass transmission line and connected to the gantry (1) via a cantilever (5).

4. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 3, characterized in that, The cantilever (5) is configured to drive the display (3) to turn, flip and fold for storage.

5. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 1, characterized in that, The gantry (1) is provided with an operating table (4) on one side, which is located on the same horizontal plane as the glass transmission line. The operating table (4) is used to temporarily store the laminated windshield glass of automobiles that fails the inspection.

6. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 1, characterized in that, The tungsten filament conductivity detection device inside the laminated windshield of an automobile also includes a barcode scanner, which is configured to scan the QR code on each piece of the laminated windshield of the automobile and transmit the acquired information to the online real-time detection system, while triggering a detection signal.

7. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 1, characterized in that, The online real-time detection system is configured to identify and alarm on the broken lines on both sides and the edge of the central dividing area of ​​the automotive windshield laminated glass.

8. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 7, characterized in that, The online real-time detection system is configured to identify, alarm, and record situations where the entire or half of the laminated windshield of the vehicle is not heated.

9. The tungsten wire conductivity detection device for laminated windshield glass of an automobile according to claim 7 or 8, characterized in that, The alarm of the online real-time detection system is an audible and visual alarm.

10. A method for detecting the conductivity of a tungsten wire inside a laminated windshield of an automobile, characterized in that, The method for detecting the conductivity of tungsten wire inside laminated windshield glass uses the tungsten wire conductivity detection device described in any one of claims 1-9 to detect the conductivity of tungsten wire inside laminated windshield glass.

Images